Posted 19 March 2010 - 03:37 PM
Yes. If it's a standard WP function, it will remain that way when using a theme.
As for the plugins..."most" is a good way to put it. We try to code our themes so that MOST plugins will be compatible with it, but quite frankly, with over 8,000 plugins in the WP repository that's hard to guarantee.
I try to just advise people when selecting plugins to choose ones that have been download a lot and have good user feedback. If some plugin has only been downloaded by only 200 people, for example, and no feedback on whether it works or not, I probably wouldn't risk it.
And we can often recommend a plugin for specific features and uses based on what we've heard or tried ourselves.
So bottom line: most will work, but not all. Choose wisely :)